Facebook profiles may get locked due to various reasons:

In the digital age, privacy has become a currency, and social media platforms like Facebook are the marketplaces where this currency is traded. As users become increasingly protective of their personal data, many choose to lock their profiles, restricting public access to their photos and details. This desire for privacy, however, has spawned a counter-phenomenon: the "FB Locked Profile DP Viewer Online." A simple search for this term yields thousands of results, all promising to bypass Facebook’s security protocols to reveal locked display pictures (DPs). This essay explores the technical reality of these tools, the privacy implications they signal, and the significant security risks they pose to the users who seek them out.

These tools may violate the privacy of Facebook users who intentionally restrict their information. By providing access to locked profiles, they could be seen as facilitating privacy breaches.